On my three-year-old quad-core Intel Core 2 system, running Windows 7 64-bit with 4GB RAM, frequently I encounter massive slowdowns in playback from Hulu, Netflix Watch Instantly (through FireFox), and using Netflix directly inside Windows Media Center.
Now I know that the problems often could be on the end of the servers streaming the content, but it's usually helpful for me to run CCleaner and then reboot.
Is there anything you guys can do to further tune the process of clearing caches and removing temporary files for applications like Windows Media Center, Netflix and Hulu?